Attachment 362414 Details for Bug 194517 – WIP

[patch] WIP

b-backup.diff (text/plain), 51.48 KB, created by Saam Barati on 2019-02-19 12:25:59 PST

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Creator: Saam Barati

Created: 2019-02-19 12:25:59 PST

Size: 51.48 KB

patch

obsolete

>Index: Source/JavaScriptCore/config.h
>===================================================================
>--- Source/JavaScriptCore/config.h	(revision 241767)
>+++ Source/JavaScriptCore/config.h	(working copy)
>@@ -25,6 +25,7 @@
> 
> #define JSC_API_AVAILABLE(...)
> #define JSC_CLASS_AVAILABLE(...) JS_EXPORT
>+#define JSC_API_DEPRECATED(...)
> // Use zero since it will be less than any possible version number.
> #define JSC_MAC_VERSION_TBA 0
> #define JSC_IOS_VERSION_TBA 0
>Index: Source/JavaScriptCore/API/JSAPIGlobalObject.h
>===================================================================
>--- Source/JavaScriptCore/API/JSAPIGlobalObject.h	(revision 241767)
>+++ Source/JavaScriptCore/API/JSAPIGlobalObject.h	(working copy)
>@@ -27,6 +27,9 @@
> 
> #include "JSGlobalObject.h"
> 
>+OBJC_CLASS JSScript;
>+OBJC_CLASS NSURL;
>+
> namespace JSC {
> 
> class JSAPIGlobalObject : public JSGlobalObject {
>@@ -55,6 +58,8 @@ public:
>     static JSInternalPromise* moduleLoaderFetch(JSGlobalObject*, ExecState*, JSModuleLoader*, JSValue, JSValue, JSValue);
>     static JSObject* moduleLoaderCreateImportMetaProperties(JSGlobalObject*, ExecState*, JSModuleLoader*, JSValue, JSModuleRecord*, JSValue);
> 
>+    JSValue loadAndEvaluateJSScriptModule(JSScript *script, NSURL *url);
>+
> private:
>     JSAPIGlobalObject(VM& vm, Structure* structure)
>         : Base(vm, structure, &s_globalObjectMethodTable)
>Index: Source/JavaScriptCore/API/JSAPIGlobalObject.mm
>===================================================================
>--- Source/JavaScriptCore/API/JSAPIGlobalObject.mm	(revision 241767)
>+++ Source/JavaScriptCore/API/JSAPIGlobalObject.mm	(working copy)
>@@ -34,8 +34,10 @@
> #import "Error.h"
> #import "Exception.h"
> #import "JSContextInternal.h"
>+#import "JSInternalPromise.h"
> #import "JSInternalPromiseDeferred.h"
> #import "JSNativeStdFunction.h"
>+#import "JSPromiseDeferred.h"
> #import "JSScriptInternal.h"
> #import "JSSourceCode.h"
> #import "JSValueInternal.h"
>@@ -162,9 +164,9 @@ JSInternalPromise* JSAPIGlobalObject::mo
>         return deferred->reject(exec, createError(exec, "No module loader provided."));
> 
>     auto deferredPromise = Strong<JSInternalPromiseDeferred>(vm, deferred);
>-    auto strongKey = Strong<JSString>(vm, jsSecureCast<JSString*>(vm, key));
>     auto* resolve = JSNativeStdFunction::create(vm, globalObject, 1, "resolve", [=] (ExecState* exec) {
>         // This captures the globalObject but that's ok because our structure keeps it alive anyway.
>+        VM& vm = exec->vm();
>         JSContext *context = [JSContext contextWithJSGlobalContextRef:toGlobalRef(globalObject->globalExec())];
>         id script = valueToObject(context, toRef(exec, exec->argument(0)));
> 
>@@ -175,7 +177,15 @@ JSInternalPromise* JSAPIGlobalObject::mo
>             return encodedJSUndefined();
>         }
> 
>-        args.append([static_cast<JSScript *>(script) jsSourceCode:moduleKey]);
>+        JSSourceCode* source = [static_cast<JSScript *>(script) jsSourceCode:moduleKey];
>+        const String& oldModuleKey = source->sourceCode().provider()->sourceOrigin().string();
>+        if (UNLIKELY(Identifier::fromString(&vm, oldModuleKey) != moduleKey)) {
>+            args.append(createTypeError(exec, makeString("The same JSScript was provided for two different identifiers, previously: ", oldModuleKey, " and now: ", moduleKey.string())));
>+            call(exec, deferredPromise->JSPromiseDeferred::reject(), args, "This should never be seen...");
>+            return encodedJSUndefined();
>+        }
>+
>+        args.append(source);
>         call(exec, deferredPromise->JSPromiseDeferred::resolve(), args, "This should never be seen...");
>         return encodedJSUndefined();
>     });
>@@ -210,6 +220,21 @@ JSObject* JSAPIGlobalObject::moduleLoade
>     return metaProperties;
> }
> 
>+JSValue JSAPIGlobalObject::loadAndEvaluateJSScriptModule(JSScript *script, NSURL *url)
>+{
>+    ASSERT(script.type == kJSScriptTypeModule);
>+    VM& vm = this->vm();
>+    auto scope = DECLARE_THROW_SCOPE(vm);
>+
>+    auto key = Identifier::fromString(&vm, [url absoluteString]);
>+    JSInternalPromise* promise = loadAndEvaluateModule(globalExec(), [script jsSourceCode:key]->sourceCode(), jsUndefined());
>+    RETURN_IF_EXCEPTION(scope, { });
>+    auto result = JSPromiseDeferred::tryCreate(globalExec(), this);
>+    RETURN_IF_EXCEPTION(scope, { });
>+    result->resolve(globalExec(), promise);
>+    return result;
>+}
>+
> }
> 
> #endif // JSC_OBJC_API_ENABLED
>Index: Source/JavaScriptCore/API/JSBase.cpp
>===================================================================
>--- Source/JavaScriptCore/API/JSBase.cpp	(revision 241767)
>+++ Source/JavaScriptCore/API/JSBase.cpp	(working copy)
>@@ -25,6 +25,7 @@
> 
> #include "config.h"
> #include "JSBase.h"
>+#include "JSBaseInternal.h"
> #include "JSBasePrivate.h"
> 
> #include "APICast.h"
>@@ -47,25 +48,15 @@
> 
> using namespace JSC;
> 
>-JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
>+JSValueRef JSEvaluateScriptInternal(const JSLockHolder&, ExecState* exec, JSContextRef ctx, JSObjectRef thisObject, const SourceCode& source, JSValueRef* exception)
> {
>-    if (!ctx) {
>-        ASSERT_NOT_REACHED();
>-        return 0;
>-    }
>-    ExecState* exec = toJS(ctx);
>-    VM& vm = exec->vm();
>-    JSLockHolder locker(vm);
>+    UNUSED_PARAM(ctx);
> 
>     JSObject* jsThisObject = toJS(thisObject);
> 
>-    startingLineNumber = std::max(1, startingLineNumber);
>-
>     // evaluate sets "this" to the global object if it is NULL
>+    VM& vm = exec->vm();
>     JSGlobalObject* globalObject = vm.vmEntryGlobalObject(exec);
>-    auto sourceURLString = sourceURL ? sourceURL->string() : String();
>-    SourceCode source = makeSource(script->string(), SourceOrigin { sourceURLString }, URL({ }, sourceURLString), TextPosition(OrdinalNumber::fromOneBasedInt(startingLineNumber), OrdinalNumber()));
>-
>     NakedPtr<Exception> evaluationException;
>     JSValue returnValue = profiledEvaluate(globalObject->globalExec(), ProfilingReason::API, source, jsThisObject, evaluationException);
> 
>@@ -80,7 +71,7 @@ JSValueRef JSEvaluateScript(JSContextRef
>         // We could stash it in the inspector in case an inspector is ever opened.
>         globalObject->inspectorController().reportAPIException(exec, evaluationException);
> #endif
>-        return 0;
>+        return nullptr;
>     }
> 
>     if (returnValue)
>@@ -90,6 +81,24 @@ JSValueRef JSEvaluateScript(JSContextRef
>     return toRef(exec, jsUndefined());
> }
> 
>+JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
>+{
>+    if (!ctx) {
>+        ASSERT_NOT_REACHED();
>+        return nullptr;
>+    }
>+    ExecState* exec = toJS(ctx);
>+    VM& vm = exec->vm();
>+    JSLockHolder locker(vm);
>+
>+    startingLineNumber = std::max(1, startingLineNumber);
>+
>+    auto sourceURLString = sourceURL ? sourceURL->string() : String();
>+    SourceCode source = makeSource(script->string(), SourceOrigin { sourceURLString }, URL({ }, sourceURLString), TextPosition(OrdinalNumber::fromOneBasedInt(startingLineNumber), OrdinalNumber()));
>+
>+    return JSEvaluateScriptInternal(locker, exec, ctx, thisObject, source, exception);
>+}
>+
> bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
> {
>     if (!ctx) {
>Index: Source/JavaScriptCore/API/JSBaseInternal.h
>===================================================================
>--- Source/JavaScriptCore/API/JSBaseInternal.h	(nonexistent)
>+++ Source/JavaScriptCore/API/JSBaseInternal.h	(working copy)
>@@ -0,0 +1,36 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc.  All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
>+ */
>+
>+#pragma once
>+
>+#include <JavaScriptCore/JSBase.h>
>+#include <JavaScriptCore/WebKitAvailability.h>
>+
>+namespace JSC {
>+class JSLockHolder;
>+class ExecState;
>+}
>+
>+extern "C" JSValueRef JSEvaluateScriptInternal(const JSC::JSLockHolder&, JSC::ExecState*, JSContextRef, JSObjectRef thisObject, const JSC::SourceCode&, JSValueRef* exception);
>Index: Source/JavaScriptCore/API/JSContext.mm
>===================================================================
>--- Source/JavaScriptCore/API/JSContext.mm	(revision 241767)
>+++ Source/JavaScriptCore/API/JSContext.mm	(working copy)
>@@ -27,6 +27,7 @@
> 
> #import "APICast.h"
> #import "Completion.h"
>+#import "JSBaseInternal.h"
> #import "JSCInlines.h"
> #import "JSContextInternal.h"
> #import "JSContextPrivate.h"
>@@ -103,17 +104,50 @@ - (JSValue *)evaluateScript:(NSString *)
>     return [self evaluateScript:script withSourceURL:nil];
> }
> 
>-- (JSValue *)evaluateScript:(NSString *)script withSourceURL:(NSURL *)sourceURL
>+static JSValue *evaluateScript(JSContext *context, RefPtr<OpaqueJSString> source, RefPtr<OpaqueJSString> url)
> {
>     JSValueRef exceptionValue = nullptr;
>+    JSValueRef result = JSEvaluateScript(context->m_context, source.get(), nullptr, url.get(), 0, &exceptionValue);
>+
>+    if (exceptionValue)
>+        return [context valueFromNotifyException:exceptionValue];
>+    return [JSValue valueWithJSValueRef:result inContext:context];
>+}
>+
>+- (JSValue *)evaluateScript:(NSString *)script withSourceURL:(NSURL *)sourceURL
>+{
>     auto scriptJS = OpaqueJSString::tryCreate(script);
>     auto sourceURLJS = OpaqueJSString::tryCreate([sourceURL absoluteString]);
>-    JSValueRef result = JSEvaluateScript(m_context, scriptJS.get(), nullptr, sourceURLJS.get(), 0, &exceptionValue);
>+    return evaluateScript(self, scriptJS, sourceURLJS);
>+}
> 
>-    if (exceptionValue)
>-        return [self valueFromNotifyException:exceptionValue];
>+- (JSValue *)evaluateJSScript:(JSScript *)script withSourceURL:(NSURL *)url
>+{
>+    if (script.type == kJSScriptTypeProgram) {
>+        auto theURL = OpaqueJSString::tryCreate([url absoluteString]); // OOPS!
>+        UNUSED_PARAM(theURL);
>+
>+        auto* jsSourceCode = [script jsSourceCode];
> 
>-    return [JSValue valueWithJSValueRef:result inContext:self];
>+        JSC::ExecState* exec = toJS(m_context);
>+        JSC::VM& vm = exec->vm();
>+        JSC::JSLockHolder locker(vm);
>+
>+        JSValueRef exceptionValue = nullptr;
>+        JSValueRef result = JSEvaluateScriptInternal(locker, exec, m_context, nullptr, jsSourceCode->sourceCode(), &exceptionValue);
>+
>+        if (exceptionValue)
>+            return [self valueFromNotifyException:exceptionValue];
>+        return [JSValue valueWithJSValueRef:result inContext:self];
>+    }
>+
>+    JSC::ExecState* exec = toJS(m_context);
>+    JSC::VM& vm = exec->vm();
>+    auto* globalObject = JSC::jsDynamicCast<JSC::JSAPIGlobalObject*>(vm, exec->lexicalGlobalObject());
>+    if (!globalObject)
>+        return [JSValue valueWithNewPromiseRejectedWithReason:[JSValue valueWithNewErrorFromMessage:@"Context does not support module loading" inContext:self] inContext:self];
>+
>+    return [JSValue valueWithJSValueRef:toRef(vm, globalObject->loadAndEvaluateJSScriptModule(script, url)) inContext:self];
> }
> 
> - (void)setException:(JSValue *)value
>@@ -300,6 +334,11 @@ - (BOOL)boolFromNotifyException:(JSValue
>     return NO;
> }
> 
>+- (JSValue *)valueFromNotifyExceptionWithString:(String&)string
>+{
>+    return [self valueFromNotifyException:[JSValue valueWithNewErrorFromMessage:string inContext:self].JSValueRef];
>+}
>+
> - (void)beginCallbackWithData:(CallbackData *)callbackData calleeValue:(JSValueRef)calleeValue thisValue:(JSValueRef)thisValue argumentCount:(size_t)argumentCount arguments:(const JSValueRef *)arguments
> {
>     Thread& thread = Thread::current();
>Index: Source/JavaScriptCore/API/JSContextPrivate.h
>===================================================================
>--- Source/JavaScriptCore/API/JSContextPrivate.h	(revision 241767)
>+++ Source/JavaScriptCore/API/JSContextPrivate.h	(working copy)
>@@ -74,6 +74,16 @@
> /*! @abstract The delegate the context will use when trying to load a module. Note, this delegate will be ignored for contexts returned by UIWebView. */
> @property (nonatomic, weak) id <JSModuleLoaderDelegate> moduleLoaderDelegate JSC_API_AVAILABLE(macosx(JSC_MAC_TBA), ios(JSC_IOS_TBA));
> 
>+/*!
>+ @method
>+ @abstract Run a JSScript.
>+ @param script the JSScript to evaluate.
>+ @discussion If the provided JSScript was created with JSScriptTypeProgram, the script will run synchronously and return the result of evaluation.
>+
>+ Otherwise, if the script was created with JSScriptTypeModule, the module will be run asynchronously and will return a promise resolved when the module and any transitive dependencies are loaded. The module loader will treat the script as if it had been returned from a delegate call to moduleLoaderDelegate with its identefier as url. This mirrors the JavaScript dynamic import operation.
>+ */
>+- (JSValue *)evaluateJSScript:(JSScript *)script withSourceURL:(NSURL *)url;
>+
> @end
> 
> #endif
>Index: Source/JavaScriptCore/API/JSScript.h
>===================================================================
>--- Source/JavaScriptCore/API/JSScript.h	(revision 241767)
>+++ Source/JavaScriptCore/API/JSScript.h	(working copy)
>@@ -31,6 +31,18 @@ NS_ASSUME_NONNULL_BEGIN
> 
> @class JSVirtualMachine;
> 
>+/*!
>+ @enum JSScriptType
>+ @abstract     A constant identifying the execution type of a JSScript.
>+ @constant     kJSScriptTypeProgram  The type of a normal JavaScript program.
>+ @constant     kJSScriptTypeModule   The type of a module JavaScript program.
>+ */
>+typedef NS_ENUM(NSInteger, JSScriptType) {
>+    kJSScriptTypeProgram,
>+    kJSScriptTypeModule,
>+};
>+
>+
> JSC_CLASS_AVAILABLE(macosx(JSC_MAC_TBA), ios(JSC_IOS_TBA))
> @interface JSScript : NSObject
> 
>@@ -41,7 +53,7 @@ JSC_CLASS_AVAILABLE(macosx(JSC_MAC_TBA),
>  @param vm The JSVirtualMachine the script can be evaluated in.
>  @result The new script.
>  */
>-+ (nullable instancetype)scriptWithSource:(NSString *)source inVirtualMachine:(JSVirtualMachine *)vm;
>++ (nullable instancetype)scriptWithSource:(NSString *)source inVirtualMachine:(JSVirtualMachine *)vm /*JSC_API_DEPRECATED(macosx(JSC_MAC_TBA), ios(JSC_IOS_TBA))*/;
> 
> /*!
>  @method
>@@ -55,13 +67,44 @@ JSC_CLASS_AVAILABLE(macosx(JSC_MAC_TBA),
> 
>  If the file at filePath is not ascii this method will return nil.
>  */
>-+ (nullable instancetype)scriptFromASCIIFile:(NSURL *)filePath inVirtualMachine:(JSVirtualMachine *)vm withCodeSigning:(nullable NSURL *)codeSigningPath andBytecodeCache:(nullable NSURL *)cachePath;
>-
>++ (nullable instancetype)scriptFromASCIIFile:(NSURL *)filePath inVirtualMachine:(JSVirtualMachine *)vm withCodeSigning:(nullable NSURL *)codeSigningPath andBytecodeCache:(nullable NSURL *)cachePath /*JSC_API_DEPRECATED(macosx(JSC_MAC_TBA), ios(JSC_IOS_TBA))*/;
> 
> /*!
>  This is deprecated and is equivalent to scriptFromASCIIFile:inVirtualMachine:withCodeSigning:andBytecodeCache:.
>  */
>-+ (nullable instancetype)scriptFromUTF8File:(NSURL *)filePath inVirtualMachine:(JSVirtualMachine *)vm withCodeSigning:(nullable NSURL *)codeSigningPath andBytecodeCache:(nullable NSURL *)cachePath;
>++ (nullable instancetype)scriptFromUTF8File:(NSURL *)filePath inVirtualMachine:(JSVirtualMachine *)vm withCodeSigning:(nullable NSURL *)codeSigningPath andBytecodeCache:(nullable NSURL *)cachePath /*JSC_API_DEPRECATED(macosx(JSC_MAC_TBA), ios(JSC_IOS_TBA))*/;
>+
>+/*!
>+ @method
>+ @abstract Create a JSScript for the specified virtual machine.
>+ @param type The type of JavaScript source.
>+ @param source The source code to use when the script is evaluated by the JS vm.
>+ @param vm The JSVirtualMachine the script can be evaluated in.
>+ @param cachePath A URL containing the path where the VM should cache for future execution.
>+ @param error A description of why the script could not be created if the result is nil.
>+ @result The new script.
>+ */
>++ (nullable instancetype)scriptOfType:(JSScriptType)type withSource:(NSString *)source inVirtualMachine:(JSVirtualMachine *)vm andBytecodeCache:(nullable NSURL *)cachePath error:(out NSError * _Nullable * _Nullable)error;
>+
>+/*!
>+ @method
>+ @abstract Create a JSScript for the specified virtual machine with a path to a codesigning and bytecode caching.
>+ @param type The type of JavaScript source.
>+ @param filePath A URL containing the path to a JS source code file on disk.
>+ @param vm The JSVirtualMachine the script can be evaluated in.
>+ @param cachePath A URL containing the path where the VM should cache for future execution.
>+ @param error A description of why the script could not be created if the result is nil.
>+ @result The new script.
>+ @discussion The files at filePath and cachePath should not be externally modified for the lifecycle of vm. This method will file back the memory for the source.
>+
>+ If the file at filePath is not ascii this method will return nil.
>+ */
>++ (nullable instancetype)scriptOfType:(JSScriptType)type memoryMappedFromASCIIFile:(NSURL *)filePath inVirtualMachine:(JSVirtualMachine *)vm andBytecodeCache:(nullable NSURL *)cachePath error:(out NSError * _Nullable * _Nullable)error;
>+
>+/*! @abstract The type of script provided during creation. */
>+@property (readonly) JSScriptType type;
>+
>+- (BOOL)cacheBytecodeWithError:(out NSError * _Nullable * _Nullable)error;
> 
> @end
> 
>Index: Source/JavaScriptCore/API/JSScript.mm
>===================================================================
>--- Source/JavaScriptCore/API/JSScript.mm	(revision 241767)
>+++ Source/JavaScriptCore/API/JSScript.mm	(working copy)
>@@ -36,11 +36,14 @@
> #import "ParserError.h"
> #import "Symbol.h"
> #include <sys/stat.h>
>+#include <wtf/FileSystem.h>
> 
> #if JSC_OBJC_API_ENABLED
> 
> @implementation JSScript {
>     __weak JSVirtualMachine* m_virtualMachine;
>+    JSScriptType m_type;
>+    FileSystem::MappedFileData m_mappedSource;
>     String m_source;
>     RetainPtr<NSURL> m_cachePath;
>     JSC::CachedBytecode m_cachedBytecode;
>@@ -116,6 +119,51 @@ + (instancetype)scriptFromUTF8File:(NSUR
>     return [JSScript scriptFromASCIIFile:filePath inVirtualMachine:vm withCodeSigning:codeSigningPath andBytecodeCache:cachePath];
> }
> 
>+static JSScript *createError(NSString *message, NSError** error)
>+{
>+    if (error)
>+        *error = [NSError errorWithDomain:@"JSScriptErrorDomain" code:1 userInfo:@{ @"message": message }];
>+    return nil;
>+}
>+
>++ (instancetype)scriptOfType:(JSScriptType)type withSource:(NSString *)source inVirtualMachine:(JSVirtualMachine *)vm andBytecodeCache:(NSURL *)cachePath error:(NSError **)error
>+{
>+    UNUSED_PARAM(error);
>+    JSScript *result = [[[JSScript alloc] init] autorelease];
>+    result->m_virtualMachine = vm;
>+    result->m_type = type;
>+    result->m_source = source;
>+    result->m_cachePath = cachePath;
>+    [result readCache];
>+    return result;
>+}
>+
>++ (instancetype)scriptOfType:(JSScriptType)type memoryMappedFromASCIIFile:(NSURL *)filePath inVirtualMachine:(JSVirtualMachine *)vm andBytecodeCache:(NSURL *)cachePath error:(NSError **)error
>+{
>+    UNUSED_PARAM(error);
>+    URL filePathURL([filePath absoluteURL]);
>+    if (!filePathURL.isLocalFile())
>+        return createError([NSString stringWithFormat:@"File path %@ is not a local file", static_cast<NSString *>(filePathURL)], error);
>+
>+    bool success = false;
>+    String systemPath = filePathURL.fileSystemPath();
>+    FileSystem::MappedFileData fileData(systemPath, success);
>+    if (!success)
>+        return createError([NSString stringWithFormat:@"File at path %@ could not be mapped.", static_cast<NSString *>(systemPath)], error);
>+
>+    if (!charactersAreAllASCII(reinterpret_cast<const LChar*>(fileData.data()), fileData.size()))
>+        return createError([NSString stringWithFormat:@"Not all characters in file at %@ are ASCII.", static_cast<NSString *>(systemPath)], error);
>+
>+    JSScript *result = [[[JSScript alloc] init] autorelease];
>+    result->m_virtualMachine = vm;
>+    result->m_type = type;
>+    result->m_source = String(StringImpl::createWithoutCopying(bitwise_cast<const LChar*>(fileData.data()), fileData.size()));
>+    result->m_mappedSource = WTFMove(fileData);
>+    result->m_cachePath = cachePath;
>+    [result readCache];
>+    return result;
>+}
>+
> - (void)dealloc
> {
>     if (m_cachedBytecode.size() && !m_cachedBytecode.owned())
>@@ -152,22 +200,14 @@ - (void)readCache
>     m_cachedBytecode = JSC::CachedBytecode { buffer, size };
> }
> 
>-- (void)writeCache
>+- (BOOL)cacheBytecodeWithError:(NSError **)error
> {
>-    if (m_cachedBytecode.size() || !m_cachePath)
>-        return;
>-
>-    JSC::ParserError error;
>-    m_cachedBytecode = JSC::generateModuleBytecode(m_virtualMachine.vm, m_jsSourceCode->sourceCode(), error);
>-    if (error.isValid())
>-        return;
>-    int fd = open([m_cachePath path].UTF8String, O_CREAT | O_WRONLY, 0666);
>-    if (fd == -1)
>-        return;
>-    int rc = flock(fd, LOCK_EX | LOCK_NB);
>-    if (!rc)
>-        write(fd, m_cachedBytecode.data(), m_cachedBytecode.size());
>-    close(fd);
>+    String errorString { };
>+    [self writeCache:errorString];
>+    if (!errorString.isNull())
>+        return !!createError(errorString, error);
>+ 
>+    return YES;
> }
> 
> @end
>@@ -189,23 +229,80 @@ - (const JSC::CachedBytecode*)cachedByte
>     return &m_cachedBytecode;
> }
> 
>+- (JSC::JSSourceCode*)jsSourceCode
>+{
>+    ASSERT(m_type != kJSScriptTypeModule);
>+
>+    if (m_jsSourceCode)
>+        return m_jsSourceCode.get();
>+
>+    JSC::VM& vm = m_virtualMachine.vm;
>+    JSC::JSLockHolder locker(vm);
>+
>+    TextPosition startPosition { };
>+    // OOPS: figure out URL/SourceOrigin.
>+    Ref<JSScriptSourceProvider> sourceProvider = JSScriptSourceProvider::create(self, JSC::SourceOrigin(), URL(), TextPosition { }, JSC::SourceProviderSourceType::Program);
>+    JSC::SourceCode sourceCode(WTFMove(sourceProvider), startPosition.m_line.oneBasedInt(), startPosition.m_column.oneBasedInt());
>+    JSC::JSSourceCode* jsSourceCode = JSC::JSSourceCode::create(vm, WTFMove(sourceCode));
>+    m_jsSourceCode.set(vm, jsSourceCode);
>+    return jsSourceCode;
>+}
>+
> - (JSC::JSSourceCode*)jsSourceCode:(const JSC::Identifier&)moduleKey
> {
>-    if (m_jsSourceCode) {
>-        ASSERT(moduleKey.impl() == m_moduleKey);
>+    if (m_jsSourceCode)
>         return m_jsSourceCode.get();
>-    }
> 
>     JSC::VM& vm = m_virtualMachine.vm;
>+    JSC::JSLockHolder locker(vm);
>+
>     TextPosition startPosition { };
>     Ref<JSScriptSourceProvider> sourceProvider = JSScriptSourceProvider::create(self, JSC::SourceOrigin(moduleKey.string()), URL({ }, moduleKey.string()), TextPosition(), JSC::SourceProviderSourceType::Module);
>     JSC::SourceCode sourceCode(WTFMove(sourceProvider), startPosition.m_line.oneBasedInt(), startPosition.m_column.oneBasedInt());
>     JSC::JSSourceCode* jsSourceCode = JSC::JSSourceCode::create(vm, WTFMove(sourceCode));
>     m_jsSourceCode.set(vm, jsSourceCode);
>-    [self writeCache];
>     return jsSourceCode;
> }
> 
>+- (BOOL)writeCache:(String&)error
>+{
>+    if (m_cachedBytecode.size()) {
>+        dataLogLn("Already have cached bytecode!");
>+        return YES;
>+    }
>+
>+    if (!m_cachePath) {
>+        error = "no cache path provided";
>+        return NO;
>+    }
>+
>+    JSC::ParserError parserError;
>+    if (m_type == kJSScriptTypeModule) {
>+        auto key = JSC::Identifier::fromString(&m_virtualMachine.vm, "API Placeholder string"_s);
>+        m_cachedBytecode = JSC::generateModuleBytecode(m_virtualMachine.vm, [self jsSourceCode:key]->sourceCode(), parserError);
>+    } else {
>+        ASSERT(m_type == kJSScriptTypeProgram);
>+        m_cachedBytecode = JSC::generateBytecode(m_virtualMachine.vm, [self jsSourceCode]->sourceCode(), parserError);
>+    }
>+    if (parserError.isValid()) {
>+        m_cachedBytecode = { };
>+        error = "unable to generate complete bytecode";
>+        return NO;
>+    }
>+    int fd = open([m_cachePath path].UTF8String, O_CREAT | O_WRONLY, 0666);
>+    if (fd == -1) {
>+        error = makeString("Unable to open file: ", [m_cachePath path].UTF8String, " due to error: ", strerror(errno));
>+        return NO;
>+    }
>+    int returnCode = flock(fd, LOCK_EX | LOCK_NB);
>+    if (returnCode)
>+        error = "Unable to lock the cache file; it may already be in use.";
>+    else
>+        write(fd, m_cachedBytecode.data(), m_cachedBytecode.size());
>+    dataLogLn("Wrote cached bytecode!");
>+    close(fd);
>+    return !returnCode;
>+}
> @end
> 
> 
>Index: Source/JavaScriptCore/API/JSScriptInternal.h
>===================================================================
>--- Source/JavaScriptCore/API/JSScriptInternal.h	(revision 241767)
>+++ Source/JavaScriptCore/API/JSScriptInternal.h	(working copy)
>@@ -48,6 +48,8 @@ class String;
> - (const WTF::String&)source;
> - (const JSC::CachedBytecode*)cachedBytecode;
> - (JSC::JSSourceCode*)jsSourceCode:(const JSC::Identifier&)moduleKey;
>+- (JSC::JSSourceCode*)jsSourceCode;
>+- (BOOL)writeCache:(String&)error;
> 
> @end
> 
>Index: Source/JavaScriptCore/API/JSScriptSourceProvider.mm
>===================================================================
>--- Source/JavaScriptCore/API/JSScriptSourceProvider.mm	(revision 241767)
>+++ Source/JavaScriptCore/API/JSScriptSourceProvider.mm	(working copy)
>@@ -42,7 +42,10 @@ StringView JSScriptSourceProvider::sourc
> 
> const JSC::CachedBytecode* JSScriptSourceProvider::cachedBytecode() const
> {
>-    return [m_script.get() cachedBytecode];
>+    auto* result = [m_script.get() cachedBytecode];
>+    if (result)
>+        dataLogLn("returning non-null cached bytecode!");
>+    return result;
> }
> 
> #endif // JSC_OBJC_API_ENABLED
>Index: Source/JavaScriptCore/API/tests/testIncludes.m
>===================================================================
>--- Source/JavaScriptCore/API/tests/testIncludes.m	(revision 241767)
>+++ Source/JavaScriptCore/API/tests/testIncludes.m	(working copy)
>@@ -27,6 +27,7 @@
> // Since we include files that haven't passed through the rewriter we need to handle the non-rewritten values...
> #define JSC_API_AVAILABLE(...)
> #define JSC_CLASS_AVAILABLE(...)
>+#define JSC_API_DEPRECATED(...)
> #define JSC_MAC_VERSION_TBA 0
> #define JSC_IOS_VERSION_TBA 0
> 
>Index: Source/JavaScriptCore/API/tests/testapi.c
>===================================================================
>--- Source/JavaScriptCore/API/tests/testapi.c	(revision 241767)
>+++ Source/JavaScriptCore/API/tests/testapi.c	(working copy)
>@@ -67,7 +67,7 @@
> #endif
> 
> #if JSC_OBJC_API_ENABLED
>-void testObjectiveCAPI(void);
>+void testObjectiveCAPI(const char*);
> #endif
> 
> int testCAPIViaCpp(const char* filter);
>@@ -1380,11 +1380,11 @@ int main(int argc, char* argv[])
>     SetErrorMode(0);
> #endif
> 
>+    const char* filter = argc > 1 ? argv[1] : NULL;
> #if JSC_OBJC_API_ENABLED
>-    testObjectiveCAPI();
>+    testObjectiveCAPI(filter);
> #endif
> 
>-    const char* filter = argc > 1 ? argv[1] : NULL;
>     RELEASE_ASSERT(!testCAPIViaCpp(filter));
>     if (filter)
>         return 0;
>Index: Source/JavaScriptCore/API/tests/testapi.mm
>===================================================================
>--- Source/JavaScriptCore/API/tests/testapi.mm	(revision 241767)
>+++ Source/JavaScriptCore/API/tests/testapi.mm	(working copy)
>@@ -41,12 +41,14 @@
> #import "Regress141275.h"
> #import "Regress141809.h"
> 
>+#import <libproc.h>
> #import <pthread.h>
> #import <vector>
> #import <wtf/MemoryFootprint.h>
> #import <wtf/Optional.h>
> #import <wtf/DataLog.h>
> 
>+
> extern "C" void JSSynchronousGarbageCollectForDebugging(JSContextRef);
> extern "C" void JSSynchronousEdenCollectForDebugging(JSContextRef);
> 
>@@ -54,7 +56,7 @@ extern "C" bool _Block_has_signature(id)
> extern "C" const char * _Block_signature(id);
> 
> extern int failed;
>-extern "C" void testObjectiveCAPI(void);
>+extern "C" void testObjectiveCAPI(const char*);
> extern "C" void checkResult(NSString *, bool);
> 
> #if JSC_OBJC_API_ENABLED
>@@ -1985,9 +1987,9 @@ static void testBytecodeCache()
>     @autoreleasepool {
>         NSURL* tempDirectory = [NSURL fileURLWithPath:NSTemporaryDirectory() isDirectory:YES];
> 
>-        NSString* fooSource = @"import { n } from \"../foo.js\"; export let foo = n;";
>-        NSString* barSource = @"import \"otherDirectory/baz.js\"; export let n = null;";
>-        NSString* bazSource = @"import { foo } from \"../directory/bar.js\"; globalThis.ran = null; export let exp = foo;";
>+        NSString* fooSource = @"import \"otherDirectory/baz.js\"; export let n = null;";
>+        NSString* barSource = @"import { n } from \"../foo.js\"; export let foo = () => n;";
>+        NSString* bazSource = @"import { foo } from \"../directory/bar.js\"; globalThis.ran = null; export let exp = foo();";
> 
>         NSURL* fooPath = [tempDirectory URLByAppendingPathComponent:@"foo.js"];
>         NSURL* barPath = [tempDirectory URLByAppendingPathComponent:@"bar.js"];
>@@ -2023,12 +2025,14 @@ static void testBytecodeCache()
>         }
> 
>         NSFileManager* fileManager = [NSFileManager defaultManager];
>-        [fileManager removeItemAtURL:fooPath error:nil];
>-        [fileManager removeItemAtURL:barPath error:nil];
>-        [fileManager removeItemAtURL:bazPath error:nil];
>-        [fileManager removeItemAtURL:fooCachePath error:nil];
>-        [fileManager removeItemAtURL:barCachePath error:nil];
>-        [fileManager removeItemAtURL:bazCachePath error:nil];
>+        BOOL removedAll = true;
>+        removedAll &= [fileManager removeItemAtURL:fooPath error:nil];
>+        removedAll &= [fileManager removeItemAtURL:barPath error:nil];
>+        removedAll &= [fileManager removeItemAtURL:bazPath error:nil];
>+        removedAll &= [fileManager removeItemAtURL:fooCachePath error:nil];
>+        removedAll &= [fileManager removeItemAtURL:barCachePath error:nil];
>+        removedAll &= [fileManager removeItemAtURL:bazCachePath error:nil];
>+        checkResult(@"Removed all temp files created", removedAll);
>     }
> }
> 
>@@ -2078,7 +2082,7 @@ - (void)context:(JSContext *)context fet
> 
> @end
> 
>-static void testLoadBasicFile()
>+static void testLoadBasicFileLegacySPI()
> {
>     @autoreleasepool {
>         auto *context = [JSContextFileLoaderDelegate newContext];
>@@ -2089,34 +2093,118 @@ static void testLoadBasicFile()
>     }
> }
> 
>-void testObjectiveCAPI()
>+
>+@interface JSContextMemoryMappedLoaderDelegate : JSContext <JSModuleLoaderDelegate>
>+
>++ (instancetype)newContext;
>+
>+@end
>+
>+@implementation JSContextMemoryMappedLoaderDelegate {
>+}
>+
>++ (instancetype)newContext
>+{
>+    auto *result = [[JSContextMemoryMappedLoaderDelegate alloc] init];
>+    return result;
>+}
>+
>+- (void)context:(JSContext *)context fetchModuleForIdentifier:(JSValue *)identifier withResolveHandler:(JSValue *)resolve andRejectHandler:(JSValue *)reject
>+{
>+    NSURL *filePath = [NSURL URLWithString:[identifier toString]];
>+    auto *script = [JSScript scriptOfType:kJSScriptTypeModule memoryMappedFromASCIIFile:filePath inVirtualMachine:context.virtualMachine andBytecodeCache:nil error:nil];
>+    if (script)
>+        [resolve callWithArguments:@[script]];
>+    else
>+        [reject callWithArguments:@[[JSValue valueWithNewErrorFromMessage:@"Unable to create Script" inContext:context]]];
>+}
>+
>+@end
>+
>+static void testLoadBasicFile()
>+{
>+    size_t count = proc_pidinfo(getpid(), PROC_PIDLISTFDS, 0, 0, 0);
>+    @autoreleasepool {
>+        auto *context = [JSContextMemoryMappedLoaderDelegate newContext];
>+        context.moduleLoaderDelegate = context;
>+        JSValue *promise = [context evaluateScript:@"import('./basic.js');" withSourceURL:resolvePathToScripts()];
>+        JSValue *null = [JSValue valueWithNullInContext:context];
>+        size_t afterCount = proc_pidinfo(getpid(), PROC_PIDLISTFDS, 0, 0, 0);
>+        checkResult(@"JSScript should not hold a file descriptor", count == afterCount);
>+        checkModuleCodeRan(context, promise, null);
>+    }
>+    size_t after = proc_pidinfo(getpid(), PROC_PIDLISTFDS, 0, 0, 0);
>+    checkResult(@"File descriptor count sholudn't change after context is dealloced", count == after);
>+}
>+
>+static void testJSScriptURL()
>+{
>+    @autoreleasepool {
>+        auto *context = [JSContextMemoryMappedLoaderDelegate newContext];
>+        context.moduleLoaderDelegate = context;
>+        NSURL *url = [NSURL URLWithString:@"./basic.js" relativeToURL:resolvePathToScripts()];
>+        JSScript *script = [JSScript scriptOfType:kJSScriptTypeModule memoryMappedFromASCIIFile:url inVirtualMachine:context.virtualMachine andBytecodeCache:nil error:nil];
>+
>+        JSValue *result1 = [context evaluateJSScript:script withSourceURL:[NSURL fileURLWithPath:@"/foo/bar.js"]];
>+        JSValue *null = [JSValue valueWithNullInContext:context];
>+        checkModuleCodeRan(context, result1, null);
>+
>+        JSValue *result2 = [context evaluateJSScript:script withSourceURL:[NSURL fileURLWithPath:@"/foo/baz.js"]];
>+
>+        __block bool wasRejected = false;
>+        [result2 invokeMethod:@"catch" withArguments:@[^(JSValue *reason) {
>+            wasRejected = [reason isObject];
>+        }]];
>+
>+        checkResult(@"Module JSScript imported with different identifiers is rejected", wasRejected);
>+    }
>+}
>+
>+#define RUN(test) do { \
>+        if (!shouldRun(#test)) \
>+            break; \
>+        NSLog(@"%s...\n", #test); \
>+        test; \
>+        NSLog(@"%s: done.\n", #test); \
>+    } while (false)
>+
>+void testObjectiveCAPI(const char* filter)
> {
>     NSLog(@"Testing Objective-C API");
> 
>-    checkNegativeNSIntegers();
>-    runJITThreadLimitTests();
>+    auto shouldRun = [&] (const char* test) -> bool {
>+        if (filter)
>+            return strcasestr(test, filter);
>+        return true;
>+    };
>+
>+    RUN(checkNegativeNSIntegers());
>+    RUN(runJITThreadLimitTests());
>+
>+    RUN(testLoaderResolvesAbsoluteScriptURL());
>+    RUN(testFetch());
>+    RUN(testFetchWithTwoCycle());
>+    RUN(testFetchWithThreeCycle());
>+    RUN(testImportModuleTwice());
>+    RUN(testBytecodeCache());
> 
>-    testLoaderResolvesAbsoluteScriptURL();
>-    testFetch();
>-    testFetchWithTwoCycle();
>-    testFetchWithThreeCycle();
>-    testImportModuleTwice();
>-    testBytecodeCache();
>+    RUN(testLoaderRejectsNilScriptURL());
>+    RUN(testLoaderRejectsFailedFetch());
> 
>-    testLoaderRejectsNilScriptURL();
>-    testLoaderRejectsFailedFetch();
>+    RUN(testJSScriptURL());
> 
>     // File loading
>-    testLoadBasicFile();
>+    RUN(testLoadBasicFileLegacySPI());
>+    RUN(testLoadBasicFile());
> 
>-    promiseWithExecutor(Resolution::ResolveEager);
>-    promiseWithExecutor(Resolution::RejectEager);
>-    promiseWithExecutor(Resolution::ResolveLate);
>-    promiseWithExecutor(Resolution::RejectLate);
>-    promiseRejectOnJSException();
>-    promiseCreateResolved();
>-    promiseCreateRejected();
>-    parallelPromiseResolveTest();
>+    RUN(promiseWithExecutor(Resolution::ResolveEager));
>+    RUN(promiseWithExecutor(Resolution::RejectEager));
>+    RUN(promiseWithExecutor(Resolution::ResolveLate));
>+    RUN(promiseWithExecutor(Resolution::RejectLate));
>+    RUN(promiseRejectOnJSException());
>+    RUN(promiseCreateResolved());
>+    RUN(promiseCreateRejected());
>+    RUN(parallelPromiseResolveTest());
> 
>     testObjectiveCAPIMain();
> }
>Index: Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj
>===================================================================
>--- Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj	(revision 241767)
>+++ Source/JavaScriptCore/JavaScriptCore.xcodeproj/project.pbxproj	(working copy)
>@@ -1160,6 +1160,7 @@
> 		797E07AA1B8FCFB9008400BA /* JSGlobalLexicalEnvironment.h in Headers */ = {isa = PBXBuildFile; fileRef = 797E07A81B8FCFB9008400BA /* JSGlobalLexicalEnvironment.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		7980C16D1E3A940E00B71615 /* DFGRegisteredStructureSet.h in Headers */ = {isa = PBXBuildFile; fileRef = 7980C16B1E3A940E00B71615 /* DFGRegisteredStructureSet.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		7986943B1F8C0ACC009232AE /* StructureCache.h in Headers */ = {isa = PBXBuildFile; fileRef = 7986943A1F8C0AC8009232AE /* StructureCache.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		79872C48221BBAF3008C6969 /* JSBaseInternal.h in Headers */ = {isa = PBXBuildFile; fileRef = 79872C47221BBAED008C6969 /* JSBaseInternal.h */; };
> 		798937791DCAB57300F8D4FB /* JSFixedArray.h in Headers */ = {isa = PBXBuildFile; fileRef = 798937771DCAB57300F8D4FB /* JSFixedArray.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		799EF7C41C56ED96002B0534 /* B3PCToOriginMap.h in Headers */ = {isa = PBXBuildFile; fileRef = 799EF7C31C56ED96002B0534 /* B3PCToOriginMap.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		79A090801D768465008B889B /* HashMapImpl.h in Headers */ = {isa = PBXBuildFile; fileRef = 79A0907E1D768465008B889B /* HashMapImpl.h */; settings = {ATTRIBUTES = (Private, ); }; };
>@@ -3771,6 +3772,7 @@
> 		7980C16B1E3A940E00B71615 /* DFGRegisteredStructureSet.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = DFGRegisteredStructureSet.h; path = dfg/DFGRegisteredStructureSet.h; sourceTree = "<group>"; };
> 		798694391F8C0AC7009232AE /* StructureCache.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = StructureCache.cpp; sourceTree = "<group>"; };
> 		7986943A1F8C0AC8009232AE /* StructureCache.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = StructureCache.h; sourceTree = "<group>"; };
>+		79872C47221BBAED008C6969 /* JSBaseInternal.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = JSBaseInternal.h; sourceTree = "<group>"; };
> 		798937761DCAB57300F8D4FB /* JSFixedArray.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = JSFixedArray.cpp; sourceTree = "<group>"; };
> 		798937771DCAB57300F8D4FB /* JSFixedArray.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSFixedArray.h; sourceTree = "<group>"; };
> 		799EF7C31C56ED96002B0534 /* B3PCToOriginMap.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = B3PCToOriginMap.h; path = b3/B3PCToOriginMap.h; sourceTree = "<group>"; };
>@@ -5991,6 +5993,7 @@
> 				C2CF39BF16E15A8100DD69BE /* JSAPIWrapperObject.mm */,
> 				1421359A0A677F4F00A8195E /* JSBase.cpp */,
> 				142711380A460BBB0080EEEA /* JSBase.h */,
>+				79872C47221BBAED008C6969 /* JSBaseInternal.h */,
> 				140D17D60E8AD4A9000CD17D /* JSBasePrivate.h */,
> 				1440F8AD0A508D200005F061 /* JSCallbackConstructor.cpp */,
> 				1440F8AC0A508D200005F061 /* JSCallbackConstructor.h */,
>@@ -9750,6 +9753,7 @@
> 				0FF42748158EBE91004CB9FF /* udis86_syn.h in Headers */,
> 				0FF42749158EBE91004CB9FF /* udis86_types.h in Headers */,
> 				A7E5AB391799E4B200D2833D /* UDis86Disassembler.h in Headers */,
>+				79872C48221BBAF3008C6969 /* JSBaseInternal.h in Headers */,
> 				A7A8AF4117ADB5F3005AB174 /* Uint16Array.h in Headers */,
> 				866739D313BFDE710023D87C /* Uint16WithFraction.h in Headers */,
> 				A7A8AF4217ADB5F3005AB174 /* Uint32Array.h in Headers */,
>Index: Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.h	(revision 241767)
>+++ Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.h	(working copy)
>@@ -191,7 +191,7 @@ public:
> 
> private:
>     UnlinkedFunctionExecutable(VM*, Structure*, const SourceCode&, FunctionMetadataNode*, UnlinkedFunctionKind, ConstructAbility, JSParserScriptMode, CompactVariableMap::Handle,  JSC::DerivedContextType, bool isBuiltinDefaultClassConstructor);
>-    UnlinkedFunctionExecutable(Decoder&, VariableEnvironment&, const CachedFunctionExecutable&);
>+    UnlinkedFunctionExecutable(Decoder&, CompactVariableMap::Handle, const CachedFunctionExecutable&);
> 
>     unsigned m_firstLineOffset;
>     unsigned m_lineCount;
>Index: Source/JavaScriptCore/parser/VariableEnvironment.h
>===================================================================
>--- Source/JavaScriptCore/parser/VariableEnvironment.h	(revision 241767)
>+++ Source/JavaScriptCore/parser/VariableEnvironment.h	(working copy)
>@@ -125,6 +125,9 @@ private:
> class CompactVariableEnvironment {
>     WTF_MAKE_FAST_ALLOCATED;
>     WTF_MAKE_NONCOPYABLE(CompactVariableEnvironment);
>+
>+    friend class CachedCompactVariableEnvironment;
>+
> public:
>     CompactVariableEnvironment(const VariableEnvironment&);
>     VariableEnvironment toVariableEnvironment() const;
>@@ -133,6 +136,8 @@ public:
>     unsigned hash() const { return m_hash; }
> 
> private:
>+    CompactVariableEnvironment() = default;
>+
>     Vector<RefPtr<UniquedStringImpl>> m_variables;
>     Vector<VariableEnvironmentEntry> m_variableMetadata;
>     unsigned m_hash;
>@@ -174,6 +179,8 @@ struct CompactVariableMapKey {
>     }
> 
> private:
>+    friend class CachedCompactVariableMapKey;
>+
>     CompactVariableEnvironment* m_environment;
> };
> 
>@@ -202,8 +209,12 @@ template<> struct HashTraits<JSC::Compac
> namespace JSC {
> 
> class CompactVariableMap : public RefCounted<CompactVariableMap> {
>+    friend class CachedCompactVariableMap;
>+
> public:
>     class Handle {
>+        friend class CachedCompactVariableMapHandle;
>+
>     public:
>         Handle() = default;
> 
>Index: Source/JavaScriptCore/runtime/CachedTypes.cpp
>===================================================================
>--- Source/JavaScriptCore/runtime/CachedTypes.cpp	(revision 241767)
>+++ Source/JavaScriptCore/runtime/CachedTypes.cpp	(working copy)
>@@ -215,9 +215,10 @@ class Decoder {
>     WTF_FORBID_HEAP_ALLOCATION;
> 
> public:
>-    Decoder(VM& vm, const void* baseAddress, size_t size)
>+    Decoder(VM& vm, const void* baseAddress, size_t size, URL&& sourceURLOverride)
>         : m_vm(vm)
>         , m_baseAddress(reinterpret_cast<const uint8_t*>(baseAddress))
>+        , m_sourceURLOverride(WTFMove(sourceURLOverride))
> #ifndef NDEBUG
>         , m_size(size)
> #endif
>@@ -259,9 +260,12 @@ public:
>         m_finalizers.add(offset, fn);
>     }
> 
>+    const URL& sourceURLOverride() { return m_sourceURLOverride; }
>+
> private:
>     VM& m_vm;
>     const uint8_t* m_baseAddress;
>+    URL m_sourceURLOverride;
> #ifndef NDEBUG
>     size_t m_size;
> #endif
>@@ -878,6 +882,98 @@ private:
>     CachedHashMap<CachedRefPtr<CachedUniquedStringImpl>, VariableEnvironmentEntry, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>, VariableEnvironmentEntryHashTraits> m_map;
> };
> 
>+class CachedCompactVariableEnvironment : public CachedObject<CompactVariableEnvironment> {
>+public:
>+    void encode(Encoder& encoder, const CompactVariableEnvironment& env)
>+    {
>+        m_variables.encode(encoder, env.m_variables);
>+        m_variableMetadata.encode(encoder, env.m_variableMetadata);
>+        m_hash = env.m_hash;
>+        m_isEverythingCaptured = env.m_isEverythingCaptured;
>+    }
>+
>+    void decode(Decoder& decoder, CompactVariableEnvironment& env) const
>+    {
>+        m_variables.decode(decoder, env.m_variables);
>+        m_variableMetadata.decode(decoder, env.m_variableMetadata);
>+        env.m_hash = m_hash;
>+        env.m_isEverythingCaptured = m_isEverythingCaptured;
>+    }
>+
>+    CompactVariableEnvironment* decode(Decoder& decoder) const
>+    {
>+        CompactVariableEnvironment* env = new CompactVariableEnvironment;
>+        decode(decoder, *env);
>+        return env;
>+    }
>+
>+private:
>+    CachedVector<CachedRefPtr<CachedUniquedStringImpl>> m_variables;
>+    CachedVector<VariableEnvironmentEntry> m_variableMetadata;
>+    unsigned m_hash;
>+    bool m_isEverythingCaptured;
>+};
>+
>+class CachedCompactVariableMapKey : public CachedObject<CompactVariableMapKey> {
>+public:
>+    void encode(Encoder& encoder, const CompactVariableMapKey& key)
>+    {
>+        m_environment.encode(encoder, key.m_environment);
>+    }
>+
>+    void decode(Decoder& decoder, CompactVariableMapKey& key) const
>+    {
>+        key.m_environment = m_environment.decode(decoder);
>+    }
>+
>+private:
>+    CachedPtr<CachedCompactVariableEnvironment> m_environment;
>+};
>+
>+class CachedCompactVariableMap : public CachedObject<CompactVariableMap> {
>+public:
>+    void encode(Encoder& encoder, const CompactVariableMap& map)
>+    {
>+        m_map.encode(encoder, map.m_map);
>+    }
>+
>+    void decode(Decoder& decoder, CompactVariableMap& map) const
>+    {
>+        m_map.decode(decoder, map.m_map);
>+    }
>+
>+    CompactVariableMap* decode(Decoder& decoder) const
>+    {
>+        CompactVariableMap* map = new CompactVariableMap;
>+        decode(decoder, *map);
>+        return map;
>+    }
>+
>+private:
>+    CachedHashMap<CachedCompactVariableMapKey, unsigned> m_map;
>+};
>+
>+class CachedCompactVariableMapHandle : public CachedObject<CompactVariableMap::Handle> {
>+public:
>+    void encode(Encoder& encoder, const CompactVariableMap::Handle& handle)
>+    {
>+        m_environment.encode(encoder, handle.m_environment);
>+        m_map.encode(encoder, handle.m_map);
>+    }
>+
>+    CompactVariableMap::Handle decode(Decoder& decoder) const
>+    {
>+        CompactVariableMap::Handle handle;
>+        handle.m_environment = m_environment.decode(decoder);
>+        handle.m_map = m_map.decode(decoder);
>+        return handle;
>+    }
>+
>+private:
>+    CachedPtr<CachedCompactVariableEnvironment> m_environment;
>+    CachedRefPtr<CachedCompactVariableMap> m_map;
>+};
>+
> template<typename T, typename Source = SourceType<T>>
> class CachedArray : public VariableLengthObject<Source*> {
> public:
>@@ -1301,10 +1397,16 @@ public:
>     {
>         String decodedSource = m_source.decode(decoder);
>         SourceOrigin decodedSourceOrigin = m_sourceOrigin.decode(decoder);
>-        String decodedURL = m_url.decode(decoder);
>+        String decodedURLString = m_url.decode(decoder);
>+        URL sourceURL;
>+        if (decoder.sourceURLOverride()) {
>+            decodedSourceOrigin = SourceOrigin { decoder.sourceURLOverride() };
>+            sourceURL = decoder.sourceURLOverride();
>+        } else
>+            sourceURL = URL(URL(), decodedURLString);
>         TextPosition decodedStartPosition = m_startPosition.decode(decoder);
> 
>-        Ref<StringSourceProvider> sourceProvider = StringSourceProvider::create(decodedSource, decodedSourceOrigin, URL(URL(), decodedURL), decodedStartPosition, sourceType);
>+        Ref<StringSourceProvider> sourceProvider = StringSourceProvider::create(decodedSource, decodedSourceOrigin, WTFMove(sourceURL), decodedStartPosition, sourceType);
>         Base::decode(decoder, sourceProvider.get());
>         return &sourceProvider.leakRef();
>     }
>@@ -1517,7 +1619,7 @@ private:
>     CachedIdentifier m_ecmaName;
>     CachedIdentifier m_inferredName;
> 
>-    CachedVariableEnvironment m_parentScopeTDZVariables;
>+    CachedCompactVariableMapHandle m_parentScopeTDZVariables;
> 
>     CachedWriteBarrier<CachedFunctionCodeBlock, UnlinkedFunctionCodeBlock> m_unlinkedCodeBlockForCall;
>     CachedWriteBarrier<CachedFunctionCodeBlock, UnlinkedFunctionCodeBlock> m_unlinkedCodeBlockForConstruct;
>@@ -1852,7 +1954,7 @@ ALWAYS_INLINE void CachedFunctionExecuta
>     m_ecmaName.encode(encoder, executable.ecmaName());
>     m_inferredName.encode(encoder, executable.inferredName());
> 
>-    m_parentScopeTDZVariables.encode(encoder, executable.parentScopeTDZVariables());
>+    m_parentScopeTDZVariables.encode(encoder, executable.m_parentScopeTDZVariables);
> 
>     m_unlinkedCodeBlockForCall.encode(encoder, executable.m_unlinkedCodeBlockForCall);
>     m_unlinkedCodeBlockForConstruct.encode(encoder, executable.m_unlinkedCodeBlockForConstruct);
>@@ -1860,10 +1962,8 @@ ALWAYS_INLINE void CachedFunctionExecuta
> 
> ALWAYS_INLINE UnlinkedFunctionExecutable* CachedFunctionExecutable::decode(Decoder& decoder) const
> {
>-    VariableEnvironment env;
>-    m_parentScopeTDZVariables.decode(decoder, env);
>-
>-    UnlinkedFunctionExecutable* executable = new (NotNull, allocateCell<UnlinkedFunctionExecutable>(decoder.vm().heap)) UnlinkedFunctionExecutable(decoder, env, *this);
>+    CompactVariableMap::Handle env = m_parentScopeTDZVariables.decode(decoder);
>+    UnlinkedFunctionExecutable* executable = new (NotNull, allocateCell<UnlinkedFunctionExecutable>(decoder.vm().heap)) UnlinkedFunctionExecutable(decoder, WTFMove(env), *this);
>     executable->finishCreation(decoder.vm());
> 
>     m_unlinkedCodeBlockForCall.decode(decoder, executable->m_unlinkedCodeBlockForCall, executable);
>@@ -1872,7 +1972,7 @@ ALWAYS_INLINE UnlinkedFunctionExecutable
>     return executable;
> }
> 
>-ALWAYS_INLINE UnlinkedFunctionExecutable::UnlinkedFunctionExecutable(Decoder& decoder, VariableEnvironment& parentScopeTDZVariables, const CachedFunctionExecutable& cachedExecutable)
>+ALWAYS_INLINE UnlinkedFunctionExecutable::UnlinkedFunctionExecutable(Decoder& decoder, CompactVariableMap::Handle parentScopeTDZVariables, const CachedFunctionExecutable& cachedExecutable)
>     : Base(decoder.vm(), decoder.vm().unlinkedFunctionExecutableStructure.get())
>     , m_firstLineOffset(cachedExecutable.firstLineOffset())
>     , m_lineCount(cachedExecutable.lineCount())
>@@ -1902,7 +2002,7 @@ ALWAYS_INLINE UnlinkedFunctionExecutable
>     , m_ecmaName(cachedExecutable.ecmaName(decoder))
>     , m_inferredName(cachedExecutable.inferredName(decoder))
> 
>-    , m_parentScopeTDZVariables(decoder.vm().m_compactVariableMap->get(parentScopeTDZVariables))
>+    , m_parentScopeTDZVariables(WTFMove(parentScopeTDZVariables))
> 
>     , m_rareData(cachedExecutable.rareData(decoder))
> {
>@@ -2080,19 +2180,24 @@ std::pair<MallocPtr<uint8_t>, size_t> en
>     return encoder.release();
> }
> 
>-UnlinkedCodeBlock* decodeCodeBlockImpl(VM& vm, const SourceCodeKey& key, const void* buffer, size_t size)
>+UnlinkedCodeBlock* decodeCodeBlockImpl(VM& vm, const SourceCodeKey& key, const void* buffer, size_t size, URL&& sourceURLOverride)
> {
>     const auto* cachedEntry = reinterpret_cast<const GenericCacheEntry*>(buffer);
>-    Decoder decoder(vm, buffer, size);
>+    Decoder decoder(vm, buffer, size, WTFMove(sourceURLOverride));
>     std::pair<SourceCodeKey, UnlinkedCodeBlock*> entry;
>     {
>         DeferGC deferGC(vm.heap);
>-        if (!cachedEntry->decode(decoder, entry))
>+        if (!cachedEntry->decode(decoder, entry)) {
>+            dataLogLn("can't decode codeblock 1!");
>             return nullptr;
>+        }
>     }
> 
>-    if (entry.first != key)
>+    if (entry.first != key) {
>+        dataLogLn("can't decode codeblock 2!");
>         return nullptr;
>+    }
>+    dataLogLn("Returning decoded CodeBlock");
>     return entry.second;
> }
> 
>Index: Source/JavaScriptCore/runtime/CachedTypes.h
>===================================================================
>--- Source/JavaScriptCore/runtime/CachedTypes.h	(revision 241767)
>+++ Source/JavaScriptCore/runtime/CachedTypes.h	(working copy)
>@@ -27,6 +27,7 @@
> 
> #include "JSCast.h"
> #include <wtf/MallocPtr.h>
>+#include <wtf/URL.h>
> 
> namespace JSC {
> 
>@@ -34,13 +35,13 @@ class SourceCodeKey;
> class UnlinkedCodeBlock;
> 
> std::pair<MallocPtr<uint8_t>, size_t> encodeCodeBlock(VM&, const SourceCodeKey&, const UnlinkedCodeBlock*);
>-UnlinkedCodeBlock* decodeCodeBlockImpl(VM&, const SourceCodeKey&, const void*, size_t);
>+UnlinkedCodeBlock* decodeCodeBlockImpl(VM&, const SourceCodeKey&, const void*, size_t, URL&&);
> 
> 
> template<typename UnlinkedCodeBlockType>
>-UnlinkedCodeBlockType* decodeCodeBlock(VM& vm, const SourceCodeKey& key, const void* buffer, size_t size)
>+UnlinkedCodeBlockType* decodeCodeBlock(VM& vm, const SourceCodeKey& key, const void* buffer, size_t size, URL&& sourceURLOverride = URL())
> {
>-    return jsCast<UnlinkedCodeBlockType*>(decodeCodeBlockImpl(vm, key, buffer, size));
>+    return jsCast<UnlinkedCodeBlockType*>(decodeCodeBlockImpl(vm, key, buffer, size, WTFMove(sourceURLOverride)));
> }
> 
> } // namespace JSC

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Attachments on bug 194517: 361720 | 361924 | 362351 | 362364 | 362365 | 362414 | 362464 | 362473 | 362579 | 362626 | 362635 | 362644 | 362653 | 362654 | 362656 | 362657 | 362663